Do data tools upload my content?
No. All data and developer tools run entirely in your browser — pasted JSON, YAML, CSV, XML, Base64, and any other text never leaves your device.
Data & Developer Tools
Free JSON, YAML, CSV, XML & Developer Tools
Convert between developer data formats, encode and decode strings, transform numbers, and parse tokens — all running in your browser with no data leaving your device.
Paste data
Start with JSON, CSV, or XML
{ "name": "ConvertWiki", "type": "toolkit" }
JSONCSVXMLBase64URL
20data tools
JSON YAML HTML CSV XML + moreformats
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Data Tools
Free online developer tools for JSON, YAML, HTML, CSV, XML, Base64, JWT, binary, hex, and roman numerals.
JSON to CSV ConverterConvert JSON to CSV online for free. Flatten arrays of objects, preview columns, and download a spreadsheet-ready CSV file.CSV to JSON ConverterConvert CSV to JSON online for free. Paste comma-separated data and generate a clean JSON array for APIs, imports, and development work.JSON Formatter & ValidatorUse this JSON formatter to format, validate, and pretty print JSON online. Clean minified JSON and find syntax errors fast in your browser.XML to JSON ConverterConvert XML to JSON online for free. Paste XML data and generate a structured JSON object with elements and attributes preserved.Base64 EncoderEncode text or data to Base64 online for free. Convert plain text into Base64 for URLs, HTML, CSS, JSON, and email workflows.Base64 DecoderDecode Base64 strings online for free. Convert Base64 back to readable text and inspect encoded data directly in your browser.URL EncoderURL encode text online for free. Percent-encode spaces, symbols, query parameters, and special characters for safe URLs.URL DecoderURL decode text online for free. Convert percent-encoded characters like %20, %3F, and %26 back to readable text.HTML EncoderEncode special characters to HTML entities online for free. Convert &, <, >, ", and more for safe use in HTML. No signup.HTML DecoderDecode HTML entities back to readable text online for free. Convert &, <, > and other entities instantly. No signup.JWT DecoderDecode JWT tokens online for free. View the header, payload, and signature of any JSON Web Token instantly. No signup.YAML to JSON ConverterConvert YAML to JSON online for free. Paste YAML config or data and get clean, formatted JSON instantly. No signup.JSON to YAML ConverterConvert JSON to YAML online for free. Turn JSON objects and arrays into clean YAML format. No signup needed.Markdown to HTML ConverterConvert Markdown to HTML online for free. Turn .md files and markdown text into clean HTML instantly. No signup needed.Binary to Decimal ConverterConvert binary to decimal online for free. Enter a binary number and get the decimal value instantly. Works in your browser.Decimal to Binary ConverterConvert decimal to binary online for free. Enter any whole number and get the binary representation instantly.Hex to Decimal ConverterConvert hexadecimal to decimal online for free. Enter a hex value and get the decimal equivalent instantly.Decimal to Hex ConverterConvert decimal numbers to hexadecimal online for free. Get hex values for integers, colors, and memory addresses instantly.Number to Roman NumeralsConvert numbers to Roman numerals online for free. Enter any number from 1 to 3999 and get the Roman numeral representation.Roman Numerals to NumberConvert Roman numerals to numbers online for free. Enter any Roman numeral and get the decimal value instantly.
How It Works
- Pick the converter or formatter for the format you are working with.
- Paste your data into the input area and run the tool.
- Copy the result or download the generated output file.
Common Uses
- Turn API responses into CSV files for spreadsheets.
- Validate and pretty-print compact JSON before debugging.
- Convert YAML config files to JSON for APIs and tooling.
- Decode JWT tokens to inspect headers and payloads.
- Encode strings safely for URLs, JSON payloads, CSS, or HTML.
- Convert numbers between binary, decimal, hex, and Roman numerals.
Data Tools FAQ
Can I download converted data?
Yes. Tools that generate text output include copy and download actions where appropriate.
What formats and conversions are available?
JSON, YAML, CSV, XML, Base64, URL encoding, HTML encoding/decoding, JWT decode, Markdown to HTML, and number conversions between binary, decimal, hex, and Roman numerals.